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The bold red and black warning colours (aposematism) indicate that the insects are foul-tasting, protecting them from predators. The nymphs have no the red-black stripe pattern, they are mostly brownish or grayish.
These shield bugs are frequently found on the umbels of Apiaceae (Heracleum, Anthriscus, Foeniculum, etc.) and often on the flowers of the Greater Pignut, Bunium bulbocastanum.